IC 4628 (aka Gum 56)
EMISSION NEBULA IN SCORPIUS
(ra 16:57/ dec -40:20)
May 2013 - Home Backyard in Martinez, Buenos Aires, Argentina
TYPE: Emission Nebula
Apparent magnitude: n/a
Apparent diameter: 90 arc minutes
Distance: 6000 light years (estimated)
SCOPE: Carbon Fiber Ritchey Chrétien 8" f8
CAMERA: QSI 583 WS
FILTERS: Baader LRGB, 2" IDAS LPS for all channels
SKY CONDITIONS: urban skies
EXPOSURES: LHaRGB (90,40,30,30,30)
OBJECT DESCRIPTION AND IMAGE SESSION
An impressive arc shaped rim of HII structure is located in the tail of the Scorpius constellation. The nebula is also known as Gum 56 after Australian astronomer Collin Gum who catalogued emission nebula using wide field photography. Nearby hot massive stars radiate the nebula with invisible ultraviolet light.
The center portion of the nebula is very bright and very difficult to process because the red saturation comes very easy. In this case I tried to put my best efforts to bring some red flavours to the main structure.